View Code of Problem 71

#include<stdio.h>
int main()
{
  float sum=0,a=1,b=2,c,N,i;
  scanf("%f",&N);
  for(i=0;i<N;i++)
  {
    sum+=b/a;
    c=a;
    a=b;
    b=b+c;
  }
  printf("%.2f",sum);
  return 0;
}